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/*
ChibiOS/RT - Copyright (C) 2006-2007 Giovanni Di Sirio.
This file is part of ChibiOS/RT.
ChibiOS/RT is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
ChibiOS/RT is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* @file AVR/serial_lld.c
* @brief AVR low level serial driver code
* @addtogroup AVR_SERIAL
* @{
*/
#include <ch.h>
#include <serial.h>
#if USE_AVR_USART0 || defined(__DOXYGEN__)
/**
* @brief USART0 serial driver identifier.
* @note The name does not follow the convention used in the other ports
* (COMn) because a name conflict with the AVR headers.
*/
SerialDriver SD1;
#endif
#if USE_AVR_USART1 || defined(__DOXYGEN__)
/**
* @brief USART1 serial driver identifier.
* @note The name does not follow the convention used in the other ports
* (COMn) because a name conflict with the AVR headers.
*/
SerialDriver SD2;
#endif
/** @brief Driver default configuration.*/
static const SerialDriverConfig default_config = {
UBRR(DEFAULT_USART_BITRATE),
(1 << UCSZ1) | (1 << UCSZ0)
};
/*===========================================================================*/
/* Low Level Driver local functions. */
/*===========================================================================*/
static void set_error(uint8_t sra, SerialDriver *sdp) {
sdflags_t sts = 0;
if (sra & (1 << DOR))
sts |= SD_OVERRUN_ERROR;
if (sra & (1 << UPE))
sts |= SD_PARITY_ERROR;
if (sra & (1 << FE))
sts |= SD_FRAMING_ERROR;
chSysLockFromIsr();
sdAddFlagsI(sdp, sts);
chSysUnlockFromIsr();
}
#if USE_AVR_USART0 || defined(__DOXYGEN__)
static void notify1(void) {
UCSR0B |= (1 << UDRIE);
}
/**
* @brief USART0 initialization.
* @param[in] config the architecture-dependent serial driver configuration
*/
static void usart0_init(const SerialDriverConfig *config) {
UBRR0L = config->brr;
UBRR0H = config->brr >> 8;
UCSR0A = 0;
UCSR0B = (1 << RXEN) | (1 << TXEN) | (1 << RXCIE);
UCSR0C = config->csrc;
}
/**
* @brief USART0 de-initialization.
*/
static void usart0_deinit(void) {
UCSR0A = 0;
UCSR0B = 0;
UCSR0C = 0;
}
#endif
#if USE_AVR_USART1 || defined(__DOXYGEN__)
static void notify2(void) {
UCSR1B |= (1 << UDRIE);
}
/**
* @brief USART1 initialization.
* @param[in] config the architecture-dependent serial driver configuration
*/
static void usart1_init(const SerialDriverConfig *config) {
UBRR1L = config->brr;
UBRR1H = config->brr >> 8;
UCSR1A = 0;
UCSR1B = (1 << RXEN) | (1 << TXEN) | (1 << RXCIE);
UCSR1C = config->csrc;
}
/**
* @brief USART1 de-initialization.
*/
static void usart1_deinit(void) {
UCSR1A = 0;
UCSR1B = 0;
UCSR1C = 0;
}
#endif
/*===========================================================================*/
/* Low Level Driver interrupt handlers. */
/*===========================================================================*/
#if USE_AVR_USART0 || defined(__DOXYGEN__)
CH_IRQ_HANDLER(USART0_RX_vect) {
uint8_t sra;
CH_IRQ_PROLOGUE();
sra = UCSR0A;
if (sra & ((1 << DOR) | (1 << UPE) | (1 << FE)))
set_error(sra, &SD1);
chSysLockFromIsr();
sdIncomingDataI(&SD1, UDR0);
chSysUnlockFromIsr();
CH_IRQ_EPILOGUE();
}
CH_IRQ_HANDLER(USART0_UDRE_vect) {
msg_t b;
CH_IRQ_PROLOGUE();
chSysLockFromIsr();
b = sdRequestDataI(&SER1);
chSysUnlockFromIsr();
if (b < Q_OK)
UCSR0B &= ~(1 << UDRIE);
else
UDR0 = b;
CH_IRQ_EPILOGUE();
}
#endif /* USE_AVR_USART0 */
#if USE_AVR_USART1 || defined(__DOXYGEN__)
CH_IRQ_HANDLER(USART1_RX_vect) {
uint8_t sra;
CH_IRQ_PROLOGUE();
sra = UCSR1A;
if (sra & ((1 << DOR) | (1 << UPE) | (1 << FE)))
set_error(sra, &SD2);
chSysLockFromIsr();
sdIncomingDataI(&SD2, UDR1);
chSysUnlockFromIsr();
CH_IRQ_EPILOGUE();
}
CH_IRQ_HANDLER(USART1_UDRE_vect) {
msg_t b;
CH_IRQ_PROLOGUE();
chSysLockFromIsr();
b = sdRequestDataI(&SD2);
chSysUnlockFromIsr();
if (b < Q_OK)
UCSR1B &= ~(1 << UDRIE);
else
UDR1 = b;
CH_IRQ_EPILOGUE();
}
#endif /* USE_AVR_USART1 */
/*===========================================================================*/
/* Low Level Driver exported functions. */
/*===========================================================================*/
/**
* Low level serial driver initialization.
*/
void sd_lld_init(void) {
#if USE_AVR_USART0
sdObjectInit(&SD1, NULL, notify1);
#endif
#if USE_AVR_USART1
sdObjectInit(&SD2, NULL, notify2);
#endif
}
/**
* @brief Low level serial driver configuration and (re)start.
*
* @param[in] sdp pointer to a @p SerialDriver object
* @param[in] config the architecture-dependent serial driver configuration.
* If this parameter is set to @p NULL then a default
* configuration is used.
*/
void sd_lld_start(SerialDriver *sdp, const SerialDriverConfig *config) {
if (config == NULL)
config = &default_config;
#if USE_AVR_USART0
usart0_init(config);
#endif
#if USE_AVR_USART1
usart1_init(config);
#endif
}
/**
* @brief Low level serial driver stop.
* @details De-initializes the USART, stops the associated clock, resets the
* interrupt vector.
*
* @param[in] sdp pointer to a @p SerialDriver object
*/
void sd_lld_stop(SerialDriver *sdp) {
#if USE_AVR_USART0
usart0_deinit();
#endif
#if USE_AVR_USART1
usart1_deinit();
#endif
}
/** @} */
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